Method and apparatus for transmitting and receiving multi- slot based long pucchs in a wireless communication system

ABSTRACT

This specification provides a long PUCCH using multiple slots in a wireless communication system. The method is performed by a user equipment and includes receiving first information about a TDD UL-DL slot configuration from a base station, receiving, from the base station, second information including a first parameter for a number of slots used for a transmission of the long PUCCH and a second parameter for a duration of a PUCCH symbol within a PUCCH slot, determining the multiple slots for transmitting the long PUCCH based on the first information and the second information, and transmitting the long PUCCH to the base station over the determined slots.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.62/581,087 filed on Nov. 3, 2017, U.S. Provisional Application No.62/586,918 filed on Nov. 16, 2017, U.S. Provisional Application No.62/591,776 filed on Nov. 29, 2017, U.S. Provisional Application No.62/593,812 filed on Dec. 1, 2017, U.S. Provisional Application No.62/595,062 filed on Dec. 5, 2017, U.S. Provisional Application No.62/616,467 filed on Jan. 12, 2018. The contents of the priorapplications are hereby incorporated by reference in their entirety.

BACKGROUND OF THE INVENTION Field of the Invention

This specification relates to a wireless communication system, and morespecifically, to a method for transmitting and receiving a long physicaluplink control channel (PUCCH) using multiple slots and an apparatussupporting the same.

Related Art

A mobile communication system has been developed to provide a voiceservice while ensuring an activity of a user. However, in the mobilecommunication system, not only a voice but also a data service isextended. At present, due to an explosive increase in traffic, there isa shortage of resources and users demand a higher speed service, and asa result, a more developed mobile communication system is required.

Requirements of a next-generation mobile communication system should beable to support acceptance of explosive data traffic, a dramaticincrease in per-user data rate, acceptance of a significant increase inthe number of connected devices, very low end-to-end latency, andhigh-energy efficiency. To this end, various technologies areresearched, which include dual connectivity, massive multiple inputmultiple output (MIMO), in-band full duplex, non-orthogonal multipleaccess (NOMA), super wideband support, device networking, and the like.

SUMMARY OF THE INVENTION

This specification provides a method of configuring a multi-slot longPUCCH for repeatedly transmitting a long PUCCH based on numerology, aslot format indicator, etc. for coverage extension.

The technical objects of the present invention are not limited to theaforementioned technical objects, and other technical objects, which arenot mentioned above, will be apparently appreciated by a person havingordinary skill in the art from the following description.

This specification provides a method of transmitting a long physicaluplink control channel (PUCCH) using multiple slots in a wirelesscommunication system.

More specifically, the method performed by a user equipment includesreceiving first information about a time division duplex (TDD) uplink(UL)-downlink (DL) slot configuration from a base station, receiving,from the base station, second information including a first parameterfor the number of slots used for a transmission of the long PUCCH and asecond parameter for a duration of a PUCCH symbol within a PUCCH slot,determining the multiple slots for transmitting the long PUCCH based onthe first information and the second information, and transmitting thelong PUCCH over the base station on the multiple slots.

Furthermore, in this specification, the multiple slots for transmittingthe long PUCCH is determined to be a specific number of slots from aconfigured starting slot.

Furthermore, in this specification, the specific number of slots isconfigured with an UL slot or an unknown slot.

Furthermore, in this specification, the number of UL symbols availablefor a transmission of the long PUCCH within the UL slot is greater thanor equal to the second parameter.

Furthermore, in this specification, when the number of UL symbolsavailable for the transmission of the long PUCCH within a specific slotof the determined slots is smaller than the second parameter, the longPUCCH is not transmitted on the specific slot.

Furthermore, in this specification, the method further includesreceiving a slot format indicator (SFI) for providing notification of aspecific TDD UL-DL slot format from the base station.

Furthermore, in this specification, the long PUCCH is transmitted usinga pre-discrete Fourier transform (DFT) orthogonal cover code (OCC).

Furthermore, in this specification, the long PUCCH resource isdetermined by pairing an OCC related to an uplink control information(UCI) part and a cyclic shift (CS) related to a reference signal.

Furthermore, in this specification, a user equipment transmitting a longphysical uplink control channel (PUCCH) using multiple slots in awireless communication system includes a radio frequency (RF) module fortransmitting and receiving radio signals and a processor functionallyconnected to the RF module, wherein the processor is configured toreceive first information about a time division duplex (TDD) uplink(UL)-downlink (DL) slot configuration from a base station, receive, fromthe base station, second information including a first parameter for thenumber of slots used for a transmission of the long PUCCH and a secondparameter for a duration of a PUCCH symbol within a PUCCH slot,determining the multiple slots for transmitting the long PUCCH based onthe first information and the second information, and transmitting thelong PUCCH to the base station over the multiple slots.

Furthermore, in this specification, the processor is configured to nottransmit the long PUCCH on a specific slot when the number of UL symbolsavailable for a transmission of the long PUCCH transmission within thespecific slot of the determined slots is smaller than the secondparameter.

Furthermore, in this specification, the processor is configured toreceive a slot format indicator (SFI) for providing notification of aspecific TDD UL-DL slot format from the base station.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to help understanding of the present invention, theaccompanying drawings which are included as a part of the DetailedDescription provide embodiments of the present invention and describethe technical features of the present invention together with theDetailed Description.

FIG. 1 shows an example of an overall system structure of an NR to whicha method proposed in this specification may be applied.

FIG. 2 shows the relation between an uplink frame and a down frame in awireless communication system to which a method proposed in thisspecification may be applied.

FIG. 3 shows an example of a resource grid supported in a wirelesscommunication system to which a method proposed in this specificationmay be applied.

FIG. 4 shows an example of a self-contained subframe structure to whicha method proposed in this specification may be applied.

FIG. 5 is a flowchart showing an example of an operation method of a UEfor transmitting a long PUCCH using multiple slots, which is proposed inthis specification.

FIG. 6 is a flowchart showing an example of an operation method of abase station for receiving a long PUCCH using multiple slots, which isproposed in this specification.

FIG. 7 shows a block diagram of a wireless communication apparatus towhich methods proposed in this specification may be applied.

FIG. 8 shows a block diagram of a communication apparatus according toan embodiment of this document.

FIG. 9 shows an example of the RF module of a wireless communicationapparatus to which a method proposed in this specification may beapplied.

FIG. 10 shows another example of the RF module of a wirelesscommunication apparatus to which a method proposed in this specificationmay be applied.

DETAILED DESCRIPTION

Some embodiments of the present disclosure are described in detail withreference to the accompanying drawings. A detailed description to bedisclosed along with the accompanying drawings is intended to describesome exemplary embodiments of the present disclosure and is not intendedto describe a sole embodiment of the present disclosure. The followingdetailed description includes more details in order to provide fullunderstanding of the present disclosure. However, those skilled in theart will understand that the present disclosure may be implementedwithout such more details.

In some cases, in order to avoid making the concept of the presentdisclosure vague, known structures and devices are omitted or may beshown in a block diagram form based on the core functions of eachstructure and device.

In the present disclosure, a base station has the meaning of a terminalnode of a network over which the base station directly communicates witha terminal. In this document, a specific operation that is described tobe performed by a base station may be performed by an upper node of thebase station according to circumstances. That is, it is evident that ina network including a plurality of network nodes including a basestation, various operations performed for communication with a terminalmay be performed by the base station or other network nodes other thanthe base station. The base station (BS) may be substituted with anotherterm, such as a fixed station, a Node B, an eNB (evolved-NodeB), a basetransceiver system (BTS), or an access point (AP). Furthermore, theterminal may be fixed or may have mobility and may be substituted withanother term, such as user equipment (UE), a mobile station (MS), a userterminal (UT), a mobile subscriber station (MSS), a subscriber station(SS), an advanced mobile station (AMS), a wireless terminal (WT), amachine-type communication (MTC) device, a machine-to-Machine (M2M)device, or a device-to-device (D2D) device.

Hereinafter, downlink (DL) means communication from a base station toUE, and uplink (UL) means communication from UE to a base station. InDL, a transmitter may be part of a base station, and a receiver may bepart of UE. In UL, a transmitter may be part of UE, and a receiver maybe part of a base station.

Specific terms used in the following description have been provided tohelp understanding of the present disclosure, and the use of suchspecific terms may be changed in various forms without departing fromthe technical sprit of the present disclosure.

The following technologies may be used in a variety of wirelesscommunication systems, such as code division multiple access (CDMA),frequency division multiple access (FDMA), time division multiple access(TDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and non-orthogonalmultiple access (NOMA). CDMA may be implemented using a radiotechnology, such as universal terrestrial radio access (UTRA) orCDMA2000. TDMA may be implemented using a radio technology, such asglobal system for mobile communications (GSM)/general packet radioservice (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA maybe implemented using a radio technology, such as Institute of electricaland electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX),IEEE 802.20, or evolved UTRA (E-UTRA). UTRA is part of a universalmobile telecommunications system (UMTS). 3rd generation partnershipproject (3GPP) Long term evolution (LTE) is part of an evolved UMTS(E-UMTS) using evolved UMTS terrestrial radio access (E-UTRA), and itadopts OFDMA in downlink and adopts SC-FDMA in uplink. LTE-advanced(LTE-A) is the evolution of 3GPP LTE.

In addition, 5G NR (new radio) defines enhanced mobile broadband (eMBB),massive machine type communications (mMTC), ultra-reliable low latencycommunications (URLLC), and vehicle-to-everything .

The 5G NR standard distinguishes between standalone (SA) andnon-standalone (NSA) depending on the co-existence between the NR systemand the LTE system.

The 5G NR supports various subcarrier spacing, CP-OFDM in the downlink,CP-OFDM in the uplink, and DFT-s-OFDM (SC-OFDM).

Embodiments of the present disclosure may be supported by the standarddocuments disclosed in at least one of IEEE 802, 3GPP, and 3GPP2, thatis, radio access systems. That is, steps or portions that belong to theembodiments of the present disclosure and that are not described inorder to clearly expose the technical spirit of the present disclosuremay be supported by the documents. Furthermore, all terms disclosed inthis document may be described by the standard documents.

In order to more clarify a description, 3GPP LTE/LTE-A is chieflydescribed, but the technical characteristics of the present disclosureare not limited thereto.

Definition of Terms

eLTE eNB: An eLTE eNB is an evolution of an eNB that supports aconnection for an EPC and an NGC.

gNB: A node for supporting NR in addition to a connection with an NGC

New RAN: A radio access network that supports NR or E-UTRA or interactswith an NGC

Network slice: A network slice is a network defined by an operator so asto provide a solution optimized for a specific market scenario thatrequires a specific requirement together with an inter-terminal range.

Network function: A network function is a logical node in a networkinfra that has a well-defined external interface and a well-definedfunctional operation.

NG-C: A control plane interface used for NG2 reference point between newRAN and an NGC

NG-U: A user plane interface used for NG3 reference point between newRAN and an NGC

Non-standalone NR: A deployment configuration in which a gNB requires anLTE eNB as an anchor for a control plane connection to an EPC orrequires an eLTE eNB as an anchor for a control plane connection to anNGC

Non-standalone E-UTRA: A deployment configuration an eLTE eNB requires agNB as an anchor for a control plane connection to an NGC.

User plane gateway: A terminal point of NG-U interface

General System

FIG. 1 is a diagram illustrating an example of an overall structure of anew radio (NR) system to which a method proposed by the presentdisclosure may be implemented.

Referring to FIG. 1, an NG-RAN is composed of gNBs that provide an NG-RAuser plane (new AS sublayer/PDCP/RLC/MAC/PHY) and a control plane (RRC)protocol terminal for a UE (User Equipment).

The gNBs are connected to each other via an Xn interface.

The gNBs are also connected to an NGC via an NG interface.

More specifically, the gNBs are connected to a Access and MobilityManagement Function (AMF) via an N2 interface and a User Plane Function(UPF) via an N3 interface.

NR (New Rat) Numerology and Frame Structure

In the NR system, multiple numerologies may be supported. Thenumerologies may be defined by subcarrier spacing and a CP (CyclicPrefix) overhead. Spacing between the plurality of subcarriers may bederived by scaling basic subcarrier spacing into an integer N (or μ). Inaddition, although a very low subcarrier spacing is assumed not to beused at a very high subcarrier frequency, a numerology to be used may beselected independent of a frequency band.

In addition, in the NR system, a variety of frame structures accordingto the multiple numerologies may be supported.

Hereinafter, an Orthogonal Frequency Division Multiplexing (OFDM)numerology and a frame structure, which may be considered in the NRsystem, will be described.

A plurality of OFDM numerologies supported in the NR system may bedefined as in Table 1.

TABLE 1 μ Δf = 2^(μ) · 15[kHz] Cyclic prefix(CP) 0 15 Normal 1 30 Normal2 60 Normal, Extended 3 120 Normal 4 240 Normal

Regarding a frame structure in the NR system, a size of various fieldsin the time domain is expressed as a multiple of a time unit ofT_(s)=1/(Δƒ_(max)·N_(f)). In this case, Δƒ_(max)=480·10³, N_(f)=4096. DLand UL transmission is configured as a radio frame having a section ofT_(f)=(Δƒ_(max)N_(f)/100)·T_(s)=10 ms. The radio frame is composed often subframes each having a section ofT_(sf)(Δƒ_(max)N_(f)/1000)·T_(s)=1 ms. In this case, there may be a setof UL frames and a set of DL frames.

FIG. 2 illustrates a relationship between a UL frame and a DL frame in awireless communication system to which a method proposed by the presentdisclosure may be implemented.

As illustrated in FIG. 2, a UL frame number I from a User Equipment (UE)needs to be transmitted T_(TA)=N_(TA)T_(s) before the start of acorresponding DL frame in the UE.

Regarding the numerology μ, slots are numbered in ascending order ofn_(s) ^(μ)∈{0, . . . , N_(subframe) ^(slots, μ)−1} subframe, and inascending order of n_(s,f) ^(μ)∈{0, . . . , N_(frame) ^(slots,μ)−1} in aradio frame. One slot is composed of continuous OFDM symbols of N_(symb)^(μ), and N_(symb) ^(μ) is determined depending on a numerology in useand slot configuration. The start of slots n_(s) ^(μ) in a subframe istemporally aligned with the start of OFDM symbols n_(s) ^(μ)N_(symb)^(μ) in the same subframe.

Not all UEs are able to transmit and receive at the same time, and thismeans that not all OFDM symbols in a DL slot or an UL slot are availableto be used.

Table 2 shows the number of OFDM symbols per slot for a normal CP in thenumerology μ, and Table 3 shows the number of OFDM symbols per slot foran extended CP in the numerology μ.

TABLE 2 Slot configuration 0 1 μ N_(symb) ^(μ) N_(frame) ^(slots,μ)N_(subframe) ^(slots,μ) N_(symb) ^(μ) N_(frame) ^(slots,μ) N_(subframe)^(slots,μ) 0 14 10 1 7 20 2 1 14 20 2 7 40 4 2 14 40 4 7 80 8 3 14 80 8— — — 4 14 160 16 — — — 5 14 320 32 — — —

TABLE 3 Slot configuration 0 1 μ N_(symb) ^(μ) N_(frame) ^(slots,μ)N_(subframe) ^(slots,μ) N_(symb) ^(μ) N_(frame) ^(slots,μ) N_(subframe)^(slots,μ) 0 12 10 1 6 20 2 1 12 20 2 6 40 4 2 12 40 4 6 80 8 3 12 80 8— — — 4 12 160 16 — — — 5 12 320 32 — — —

NR Physical Resource

Regarding physical resources in the NR system, an antenna port, aresource grid, a resource element, a resource block, a carrier part,etc. may be considered.

Hereinafter, the above physical resources possible to be considered inthe NR system will be described in more detail.

First, regarding an antenna port, the antenna port is defined such thata channel over which a symbol on one antenna port is transmitted can beinferred from another channel over which a symbol on the same antennaport is transmitted. When large-scale properties of a channel receivedover which a symbol on one antenna port can be inferred from anotherchannel over which a symbol on another antenna port is transmitted, thetwo antenna ports may be in a QC/QCL (quasi co-located or quasico-location) relationship. Herein, the large-scale properties mayinclude at least one of delay spread, Doppler spread, Doppler shift,average gain, and average delay.

FIG. 3 illustrates an example of a resource grid supported in a wirelesscommunication system to which a method proposed by the presentdisclosure may be implemented.

Referring to FIG. 3, a resource grid is composed of N_(RB) ^(μ)N_(sc)^(RB) subcarriers in a frequency domain, each subframe composed of 14·2μOFDM symbols, but the present disclosure is not limited thereto.

In the NR system, a transmitted signal is described by one or moreresource grids, composed of N_(RB) ^(μ)N_(sc) ^(RB) subcarriers, and2^(μ)N_(symb) ^((μ)) OFDM symbols Herein, N_(RB) ^(μ)≤N_(RB) ^(max,μ).The above N_(RB) ^(max,μ) indicates the maximum transmission bandwidth,and it may change not just between numerologies, but between UL and DL.

In this case, as illustrated in FIG. 3, one resource grid may beconfigured for the numerology μ and an antenna port p.

Each element of the resource grid for the numerology μ and the antennaport p is indicated as a resource element, and may be uniquelyidentified by an index pair (k,l). Herein, k=0, . . . , N_(RB)^(μ)N_(sc) ^(RB)−1 is an index in the frequency domain, and l=0, . . . ,2^(μ)N_(symb) ^((μ))−1 indicates a location of a symbol in a subframe.To indicate a resource element in a slot, the index pair (k,l) is used.Herein l=0, . . . , N_(symb) ^(μ)−1.

The resource element (k,l) for the numerology μ and the antenna port pcorresponds to a complex value a_(k,l) ^((p,μ)). When there is no riskof confusion or when a specific antenna port or numerology is specified,the indexes p and μ may be dropped and thereby the complex value maybecome a_(k,l) ^((p,μ)) or a_(k,l) .

In addition, a physical resource block is defined as N_(sc) ^(RB)=12continuous subcarriers in the frequency domain. In the frequency domain,physical resource blocks may be numbered from 0 to N_(RB) ^(μ)−1. Atthis point, a relationship between the physical resource block numbern_(PRB) and the resource elements (k,l) may be given as in Equation 1.

$\begin{matrix}{n_{PRB} = \left\lfloor \frac{k}{N_{sc}^{RB}} \right\rfloor} & \left\lbrack {{Equation}\mspace{14mu} 1} \right\rbrack\end{matrix}$

In addition, regarding a carrier part, a UE may be configured to receiveor transmit the carrier part using only a subset of a resource grid. Atthis point, a set of resource blocks which the UE is configured toreceive or transmit are numbered from 0 to N_(URB) ^(μ)−1 in thefrequency region.

Self-Contained Subframe Structure

A time division duplexing (TDD) structure taken into consideration inthe NR system is a structure in which both uplink (UL) and downlink (DL)are processed in a single subframe. This is for minimizing latency ofdata transmission in the TDD system, and such a structure is called aself-contained subframe structure.

FIG. 4 shows an example of a self-contained subframe structure to whicha method proposed in this specification may be applied. FIG. 4 is onlyfor convenience of description, and does not limit the scope of thepresent invention.

Referring to FIG. 4, in the case of legacy LTE, a case where onesubframe includes 14 orthogonal frequency division multiplexing (OFDM)symbols is assumed.

In FIG. 4, a region 402 means a downlink control region, and a region404 means an uplink control region. Furthermore, a region (i.e., aregion not having a separate indication) other than the region 402 andthe region 404 may be used for the transmission of downlink data or thetransmission of uplink data.

That is, uplink control information and downlink control information aretransmitted in one self-contained subframe. In contrast, in the case ofdata, uplink data or downlink data is transmitted in one self-containedsubframe.

If the structure shown in FIG. 4 is used, downlink transmission anduplink transmission are sequentially performed in one self-containedsubframe. The transmission of downlink data and the reception of uplinkACK/NACK may be performed.

As a result, when an error of data transmission occurs, the time takenup to the retransmission of data may be reduced. Accordingly, latencyrelated to data delivery can be minimized.

In a self-contained subframe structure such as FIG. 4, a time gap for aprocess for a base station (eNodeB, eNB, gNB) and/or a terminal (userequipment (UE)) to switch from a transmission mode to a reception modeor a process for the base station and/or the terminal to switch from thereception mode to the transmission mode is necessary. In relation to thetime gap, if uplink transmission is performed in a self-containedsubframe after downlink transmission, some OFDM symbol(s) may beconfigured as a guard period (GP).

Carrier Aggregation

A communication environment considered in embodiments of the presentinvention includes all multi-carrier support environments. That is, amulti-carrier system or carrier aggregation (CA) system used in thepresent invention is a system in which, when a target wide band isconfigured, one or more component carriers (CCs) having a bandwidthsmaller than a target bandwidth are aggregated and used in order tosupport a wide band.

In the present invention, multi-carriers refer to aggregation (orcarrier aggregation) of carriers and in this case, the aggregation ofthe carriers refers to both aggregation of contiguous carriers andaggregation of non-contiguous carriers. Further, the number ofcomponents carriers aggregated between the downlink and the uplink maybe set differently. A case where the number of downlink componentcarriers (hereinafter, referred to as ‘DL CC’) is equal to the number ofuplink component carriers (hereinafter, referred to as ‘UL CC’) isreferred to as symmetric aggregation and a case where the number ofdownlink CCs is different from the number of uplink CCs is referred toas asymmetric aggregation. Such carrier aggregation may be usedinterchangeably with terms such as carrier aggregation, bandwidthaggregation, spectrum aggregation, and the like.

Carrier aggregation configured by combining two or more componentcarriers aims at supporting up to 100 MHz bandwidth in the LTE-A system.When one or more carriers having a bandwidth smaller than the targetbandwidth are combined, the bandwidth of the combined carriers may belimited to the bandwidth used in the existing system in order tomaintain backward compatibility with the existing IMT system. Forexample, in the existing 3GPP LTE system, {1.4, 3, 5, 10, 15, 20} MHzbandwidth is supported and in 3GPP LTE-advanced system (that is, LTE-A),a bandwidth larger than 20 MHz may be supported by using only thebandwidths for compatibility with the existing system. Further, thecarrier aggregation system used in the present invention may support thecarrier aggregation by defining a new bandwidth regardless of thebandwidth used in the existing system.

The LTE-A system uses a concept of a cell to manage radio resources.

The aforementioned carrier aggregation environment may be referred to asa multiple-cell environment. The cell is defined as a combination of apair of a downlink resource (DL CC) and an uplink resource (UL CC), butthe uplink resource is not required. Accordingly, the cell may beconstituted by the downlink resource along or by the downlink resourceand the uplink resource. When a specific user equipment has only oneconfigured serving cell, the specific user equipment may have one DL CCand one UL CC, but when the specific user equipment has two or moreconfigured serving cells, the specific user equipment may have DL CCs asmany as the cells and the number of UL CCs may be equal to or smallertherethan.

Alternatively, on the contrary, the DL CC and the UL CC may beconfigured. That is, when the specific user equipment has multipleconfigured serving cells, a carrier aggregation environment in which thenumber of UL CCs is larger than the number of DL CCs may also besupported. That is, the carrier aggregation may be appreciated asaggregation of two or more different cells having carrier frequencies(center frequency of the cell), respectively. Here, the term ‘cell’needs to be distinguished from a ‘cell’ as an area covered by the basestation which is generally used.

The cell used in the LTE-A system includes a primary cell (PCell) and asecondary cell (SCell). The P cell and the S cell may be used as theserving cell. In the case of a user equipment which is in anRRC_CONNECTED state, but does not configure the carrier aggregation ordoes not support the carrier aggregation, only one serving cellconfigured only by the P cell exists. On the contrary, in the case of auser equipment which is in the RRC_CONNECTED state and configures thecarrier aggregation, one or more serving cells may exist and the entireserving cell includes the P cell and one or more S cells.

The serving cell (P cell and S cell) may be configured through an RRCparameter. PhysCellId has integer values of 0 to 503 as a physical layeridentifier of the cell. SCellIndex has integer values of 1 to 7 as ashort identifier used for identifying the S cell. ServCellIndex hasinteger values of 0 to 7 as a short identifier used for identifying theserving cell (P cell or S cell). The 0 value is applied to the P celland SCellIndex is previously granted to be applied to the S cell. Thatis, a cell having the smallest cell ID (or cell index) in ServCellIndexbecomes the P cell.

The P cell refers to a cell operating on a primary frequency (or primaryCC). The user equipment may be used to perform an initial connectionestablishment process or a connection re-establishment process and mayrefer to a cell indicated during a handover process. Further, the P cellrefers to a cell which becomes a center of control related communicationamong the serving cells configured in the carrier aggregationenvironment. That is, the user equipment may be allocated the PUCCH onlyin the P cell thereof and may transmit the allocated PUCCH and may useonly the P cell for acquiring system information or changing amonitoring procedure. Evolved Universal Terrestrial Radio Access(E-UTRAN) may change only the P cell for the handover procedure by usingan RRC connection reconfiguration message of a higher layer, whichincludes mobility control information to the user equipment thatsupports the carrier aggregation environment.

The S cell refers to a cell operating on a second frequency (orsecondary CC). Only one P cell may be allocated to the specific userequipment and one or more S cells may be allocated to the specific userequipment. The S cell may be configured after the RRC connection isconfigured and may be used to provide an additional radio resource. ThePUCCH does not exist in remaining cells other than the P cell among theserving cells configured in the carrier aggregation environment, thatis, the S cell. When the E-UTRAN adds the S cell to the user equipmentsupporting the carrier aggregation environment, the E-UTRAN may provideall the system information related to the operation of a related cellwhich is in the RRC_CONNECTED state through a dedicated signal. Thechange of the system information may be controlled by releasing andadding the related S cell and the RR connection reconfiguration messageof the higher layer may be used at this time. The E-UTRAN may performdedicated signaling with different parameters for each user equipmentrather than broadcasting within the related S cell.

After an initial security activation process starts, the E-UTRAN mayconfigure a network including one or more S cells in addition to the Pcell initially configured in the connection establishment process. Inthe carrier aggregation environment, the P cell and the S cell mayoperate as respective component carriers. In the following embodiments,the primary component carrier (PCC) may be used in the same meaning asthe P cell and the secondary component carrier (SCC) may be used in thesame meaning as the S cell.

The NR system may support a physical uplink control channel (PUCCH),that is, a physical channel for transmitting uplink control information(UCI) including information, such as HARQ-ACK, a scheduling request(SR), channel state information (CSI).

In this case, the PUCCH may be divided into a small PUCCH supportingsmall UCI payload (e.g., 1˜2-bit UCI) and a big PUCCH supporting largeUCI payload (e.g., more than 2 bits and up to hundreds of bits)depending on UCI payload.

In addition, each of the small PUCCH and the big PUCCH may be dividedinto a short PUCCH having short duration (e.g., 1˜2-symbol duration) anda long PUCCH having long duration (e.g., 4˜14-symbol duration).

Table 4 shows an example of a PUCCH format.

TABLE 4 PUCCH format Length in OFDM symbols N_(symb) ^(PUCCH) Number ofbits 0 1-2  ≤2 1 4-14 ≤2 2 1-2  >2 3 4-14 >2 4 4-14 >2

In Table 4, N_(symb) ^(PUCCH) indicates the length of PUCCH transmissionin OFDM symbols. The PUCCH formats 1, 3 and 4 may be denoted as longPUCCHs, and the PUCCH formats 0 and 2 may be denoted as short PUCCHs.

A symbol “\” used in this specification may be interpreted as the samemeaning as “and/or.” “A and/or B” may be identically interpreted as“include at least one of A or B.”

Furthermore, the Long PUCCH may be basically used to transmitmedium/large UCI payload or improve coverage of small UCI payload.

Furthermore, if it is necessary to additionally expand coverage comparedto a long PUCCH, a multi-slot long PUCCH in which the same UCIinformation is transmitted in multiple slots may be supported.

In this case, an operation of transmitting a long PUCCH using multipleslots may include an operation of repeatedly transmitting a long PUCCHin multiple slots.

For example, if coverage cannot be secured in a given UCI payload andcode rate, coverage may need to be secured through a gain according torepetitive transmission using a multi-slot long PUCCH.

The LTE system supports only 15 kHz subcarrier spacing except a specialcase, such as an MBMS or an NB-IoT, whereas the NR system supportsvarious numerologies, such as 15 kHz, 30 kHz, 60 kHz, 120 kHz and 240kHz, by considering various use cases and deployment scenarios asdescribed above.

In this case, the numerology refers to subcarrier spacing and a cyclicprefix (CP).

In the NR, if a large subcarrier is used (e.g., subcarrier spacing of 30kHz or more), a coverage reduction is inevitable compared to an LTEPUCCH due to a physical factor although a long PUCCH using all 14symbols within a slot is used due to reduced slot duration.

Accordingly, in such a case, it may be necessary to improve coverageusing a multi-slot long PUCCH.

Furthermore, although the same 15 kHz subcarrier spacing as that of LTEis used, the use of a multi-slot long PUCCH may be necessary in order tosupport the same deployment scenario as that of LTE by securing coverageof a level in which HARQ-ACK is repeated in LTE.

Hereinafter, this specification proposes a method of setting andoperating the slot number of a multi-slot long PUCCH by consideringvarious numerologies in the NR and corresponding coverage influence.

Method of setting the number of slots in a multi-slot long PUCCH

The NR system may configure and select a plurality of slot lengths inwhich a multi-slot long PUCCH is spanned for each UE by considering thatthere is a difference in the path loss depending on the location of a UEwhen a multi-slot long PUCCH is used for the above reason.

For example, if the slot number of a multi-slot long PUCCH is set to 4and selected, a multi-slot long PUCCH slot number may have a form suchas X={x0, x1, x2, x3}.

In this case, the slot number may have a relation of x0<=x1<=x2<=x3. Anon-multi-slot or single slot long PUCCH may be selected by settingx0=1.

In this case, the greatest value (e.g., x3) of multi-slot long PUCCHslot numbers X may be set to satisfy a maximum coverage/link budget/MCLnecessary for a minimum cell.

Furthermore, middle values (e.g., x1, x2) may be set as values smallerthan the greatest value (e.g., x3) so that a minimum slot numbernecessary for a given situation is allocated.

Furthermore, the multi-slot long PUCCH slot number may be UE-specificRRC configured or may be configured through dynamic indication throughDCI.

Furthermore, a method of UE-specifically RRC configuring multiple (e.g.,4) multi-slot long PUCCH slot lengths and dynamically indicating themthrough DCI may be considered.

In this case, PUCCH coverage also has a correlation with long PUCCHduration, subcarrier spacing, etc. in addition to the number of slots ina multi-slot long PUCCH.

Accordingly, in order to determine the value of the slot number in amulti-slot long PUCCH supporting various types of coverage as describedabove, specific long PUCCH duration and subcarrier spacing need to beassumed.

Hereinafter, in this specification, the assumed long PUCCH duration andsubcarrier spacing are referred to as reference long PUCCH duration Lrefand reference subcarrier spacing Sref, respectively. The determined slotnumber of a multi-slot long PUCCH is referred to as Xref.

Furthermore, long PUCCH duration and subcarrier spacing actually usedfor long PUCCH transmission in NR may be the same or different from thereference values.

In this case, values used for actual transmission are called actual longPUCCH duration L and actual subcarrier spacing S, respectively.

In the above, the reference or actual long PUCCH duration may mean 1)the total number of symbols including an UCI symbol and a DMRS symbolconfiguring a PUCCH or 2) the number of UCI symbols used for UCItransmission among symbols configuring a PUCCH.

In this case, the NR can support various types of long PUCCH durationand subcarrier spacing as described above in addition to the Lref andSref values. The following methods are proposed as a method of setting amulti-slot long PUCCH slot number in the NR by considering such asituation.

Method of Setting the Number of Slots in a Multi-Slot Long PUCCHAccording to Long PUCCH Duration in the Same Subcarrier Spacing

In the same subcarrier spacing (e.g., reference subcarrier spacing),long PUCCH duration L may be different from reference long PUCCHduration Lref.

In this case, assuming that separate multi-slot long PUCCH slot numbervalues for each long PUCCH duration, for example, four values for eachlong PUCCH duration can be set, Y={y0, y1, y2, y3}, Z={z0, z1, z2, z3},etc. may be set.

In this case, a UE may select one of multiple multi-slot long PUCCH slotnumbers (e.g., Y, Z, . . . ,) configured based on long PUCCH durationconfigured according to a separate method.

Furthermore, one of the values of the selected multi-slot long PUCCHslot numbers may be configured according to a multi-slot long PUCCH slotnumber indication method, and a multi-slot long PUCCH may be configured.

For example, if a multi-slot long PUCCH slot number Y has been selectedby long PUCCH duration L, one of Y values, for example, {y0, y1, y2, y3}may be UE-specific RRC configured or may be configured through dynamicindication through DCI.

Alternatively, after the slot number of multiple (e.g., 4) multi-slotlong PUCCHs is UE-specifically RRC configured, it may be dynamicallyconfigured through DCI.

In this case, the method has a disadvantage in that signaling overheadis great because a separate multi-slot long PUCCH slot number is setevery long PUCCH duration.

Accordingly, in order to improve this disadvantage, after only areference multi-slot long PUCCH slot number Xref assuming Lref and Srefis set, a multi-slot long PUCCH slot value according to long PUCCHduration configured with respect to a UE may be implicitly indicatedthrough Xref and Lref.

In this case, long PUCCH duration may be called L, and a correspondingmulti-slot long PUCCH slot number may be called Y.

Thereafter, a UE may calculate Y for long PUCCH duration configuredthereto like Equation 2 using L and Lref, and Xref as follows.

Y=Xref×L _(ref) /L   [Equation 2]

In this case, Lref may be the longest long PUCCH duration (i.e.,Lref=14) by considering that the motivation of a multi-slot long PUCCHis coverage extension.

If Lref/L is not an integer (e.g., Lref=14 and L=10), it may be made aninteger through ceiling, floor, truncation, etc.

Making an integer may be a ceiling operation, such as Equation 3,Equation 4, in order to find out the smallest value of integers thatsatisfy coverage/link budget/MCL.

Y=┌Xref×L _(ref) /L┐  [Equation 3]

Y=Xref×┌L _(ref) /L┐  [Equation 4]

In this case, ┌ ┐ means a ceiling operation.

For example, if Xref={1, 4, 16, 64} when Lref=14, Xref×L_(ref)/L={0.71,2.86, 11.4, 45.7} when L=10. The final Y value to which ceiling has beenapplied is Y={1, 3, 12, 64}.

In this case, a UE may configure a multi-slot long PUCCH using Ycalculated using the above method.

Furthermore, the ceiling operation may be substituted with anotherinteger method, such as floor or truncation.

In addition, in the state in which a set Xref={1, x1, x2, x3} for thenumber of slots configurable with respect to reference PUCCH symbolduration Lref (e.g., Lref=14 symbols) has been defined, a gNB mayconfigure one value (e.g., x1=2, x2=4, x3=6 or 8) within correspondingXref with respect to a UE.

In this case, if one value of Xref allocated by the gNB is xref, amulti-slot long PUCCH slot number y to be applied to actual transmissionmay be set by the following method.

(Method 1)

If xref>1 and actual PUCCH symbol duration is given as L symbols, theactual number of slots y may be set like Equation 5.

y=xref×f{Lref/L}  [Equation 5]

In this case, f{·} may be a function, such as ceiling, flooring ortruncation.

(Method 2)

If xref=1, the actual number of slots y may be set as y=1 with respectto given actual PUCCH symbol duration L.

Method of Setting the Number of Slots in a Multi-Slot Long PUCCH WhenSubcarrier Spacing Varies

As described above, PUCCH coverage also has a correlation withsubcarrier spacing in addition to the number of slots and long PUCCHduration in a multi-slot long PUCCH.

Accordingly, if long PUCCH duration is given as a symbol number, whensubcarrier spacing becomes N times even in the case of the same longPUCCH duration, the absolute time of a long PUCCH length becomes 1/Ntimes. Accordingly, if transmission power is constant, PUCCH coverage isreduced proportionately.

Furthermore, in general, in the proportion relation, since receivedpower is inverse proportion to the square of the distance between atransmitter and a receiver, coverage converted into the distance isinverse proportion to the square of transmission energy, that is,transmission power×transmission duration.

Accordingly, when subcarrier spacing becomes N times in the aboveexample, PUCCH coverage converted into the distance becomes 1/√{squareroot over (N)} times because long PUCCH transmission energy becomes 1/Ntimes.

Furthermore, PUCCH coverage requirements may be different depending onsubcarrier spacing. This may be represented as a maximum timing advance(max TA) configuration method according to the following subcarrierspacing.

In this case, the max TA may be configured for each subcarrier spacing,may be configured as the same max TA value regardless of subcarrierspacing, or may be configured as a system information block (SIB).

Furthermore, if the max TA is configured for each subcarrier spacing,the max TA may be configured to have a relation inversely proportionalto subcarrier spacing or inversely proportional to a square root.

Accordingly, the following multi-slot long PUCCH slot number settingmethod in each case may be considered.

If Max TA is Scaled According to Subcarrier Spacing

If max TA is scaled as a relation inversely proportional to subcarrierspacing (e.g., when subcarrier spacing becomes N times compared to Sref,max TA is scaled to become 1/N times or 1/√{square root over (N)}), itmay be expected that PUCCH coverage according to subcarrier spacing isalso reduced at the same ratio.

Accordingly, the UE may configure a multi-slot long PUCCH by identicallyapplying a value set based on Sref although subcarrier spacing used forPUCCH transmission has a value different from Sref.

That is, in the case of a reference multi-slot long PUCCH slot numberXref assuming Lref and Sref, the UE may apply an Xref value as amulti-slot long PUCCH slot number Y for long PUCCH duration L configuredfor the UE without any change regardless of subcarrier spacing withrespect to the same long PUCCH duration L as Lref.

Y=Xref   [Equation 6]

In this case, the UE may configure a multi-slot long PUCCH using Ycalculated using Equation 6.

If Max TA is Fixed Regardless of Subcarrier Spacing

The following relates to a method of setting a multi-slot long PUCCHslot number when Max TA is a fixed value regardless of subcarrierspacing.

In other words, if all UEs operating according to various subcarrierspacings are configured to support the same PUCCH coverage, a multi-slotlong PUCCH slot number may need to be adjusted by considering thatcoverage is reduced depending on subcarrier spacing.

As described above, when subcarrier spacing S becomes N times, that is,S=N*Sref, temporal coverage is reduced in a relation inverselyproportional to a square root when the same PUCCH transmission power isassumed because PUCCH transmission duration becomes 1/N times.

Accordingly, in this case, in order to compensate for a coveragereduction, PUCCH transmission duration may be set to be identical withthe case of Sref by increasing PUCCH transmission power N times orincreasing a multi-slot long PUCCH slot number N times in the same PUCCHtransmission power.

In this case, in the NR in which various subcarrier spacings coexist,the same coverage or max TA may need to be supported regardless ofsubcarrier spacing.

In this case, the UE may calculate Y for long PUCCH duration Lconfigured therefor using subcarrier spacing S and Sref, and Xref as inEquation 7 with respect to the same long PUCCH duration L as Lref.

Y=Xref×(S/S _(ref))   [Equation 6]

In this case, the UE may configure a multi-slot long PUCCH using Ycalculated using the method of Equation 7.

If Max TA is SIB Configurable

If Max TA is configurable as an SIB, assuming that max TA assumed when areference multi-slot long PUCCH slot number Xref is determined isTAmaxref and configured max TA is TAmax, a multi-slot long PUCCH slotnumber may be determined using the relation between TAmax and TAmaxref.

As described above, in general, since received power is in inverseproportion to the square of the distance between a transmitter and areceiver, in other words, in order to increase coverage converted intothe distance N times, transmission energy needs to be increased N²times.

In order to increase transmission energy N² times, transmission powermay be increased N² times or transmission duration needs to be increasedN² times in the case of the same transmission power.

However, transmission power may not be increased like a coverage limitedsituation.

In this case, the UE may calculate a multi-slot long PUCCH slot number Yfor long PUCCH duration L configured therefor according to a method,such as Equation 8, using the relation between TAmax and TAmaxref as inEquation 8, assuming the same PUCCH transmission power as that when Xrefis determined.

Y=Xref×(TAmax/TAmax_(ref))²   [Equation 8]

More generally, the UE may calculate a multi-slot long PUCCH slot numberY for long PUCCH duration L configured therefor according to a method,such as Equation 9, using the relation between TAmax and TAmaxrefasfollows.

Y=Xref×(TAmax/TAmax_(ref))^(M)   [Equation 9]

In Equation 9, M may representatively have a value of 1 or 2 and may bea value determined by considering a path loss situation of a channel.

In addition, the UE may calculate a multi-slot long PUCCH slot number Yfor long PUCCH duration L configured therefor using Equation 10 byconsidering that subcarrier spacing S is different from Sref.

Y=Xref×(S/S _(ref))(TAmax/TAmax_(ref))^(M)   [Equation 10]

The UE may configure a multi-slot long PUCCH using Y calculatedaccording to a method, such as Equation 10.

If the methods are generalized, they may be represented like Equation11.

$\begin{matrix}{Y = {{Xref} \times \frac{\left( {S/S_{ref}} \right)}{\left( {L/L_{ref}} \right)}\left( {{TA}\; {\max/{TA}}\; \max_{ref}} \right)^{M}}} & \left\lbrack {{Equation}\mspace{14mu} 11} \right\rbrack\end{matrix}$

RRC parameters according to long PUCCH duration and/or subcarrierspacing and/or max TA may be configured using the relation equation.

In this case, the UE may configure a multi-slot long PUCCH bycalculating a multi-slot long PUCCH slot number from Xref using Equation11.

If the UE configures a multi-slot long PUCCH using the method, the UEmay set one of multi-slot long PUCCH slot number Y values (e.g., {y0,y1, y2, y3}) calculated using the relation to “1” so that a single-slotlong PUCCH (i.e., the number of slots of the multi-slot long PUCCH=1)can be selected.

For example, a multi-slot long PUCCH may be made off by substituting(e.g., {1, y1, y2, y3}) the greatest value of the Y values with “1.”

Alternatively, for the above object, “1” may be basically supported, andthe remaining values may be configured to be scaled with the relationequation between long PUCCH duration, subcarrier spacing and max TA likethe methods.

In this case, power of a received signal is in inverse proportion to thesquare of the center frequency, assuming that power of a transmittedsignal is constant and an antenna proportional to the wavelength size ofa carrier frequency of the transmitted signal is used.

In this case, since an UL transmission range and a cell range arereduced according to the same relation, the UE may identically apply amulti-slot long PUCCH slot number Y value determined in an UL referencecarrier frequency.

Furthermore, the UE may configure a multi-slot long PUCCH slot number Yvalue for each carrier frequency by considering that a change in theantenna size and received power in an eNB according to beamforming maybe different.

Furthermore, if beamforming is applied, the UE may scale and apply thebeamforming at a path loss rate measured for each beam by incorporatinga difference in the path loss for each beam.

For example, assuming that the path losses of a beam1 and a beam2measured using channel state information (CSI) or a sounding referencesignal (SRS) through DL or UL are PL1 and PL2, respectively, the UE maydetermine a multi-slot long PUCCH slot number to be Y2 when it transmitsthe beam2 using the ratio of PL1 and PL2.

For example, if the UE performs transmission using the same transmissionpower P due to a power limitation, eNB-received power for a signaltransmitted using the beam1 is P*PL1, and received power of the beam2 isP*PL2, a multi-slot long PUCCH slot number may be scaled and applied atthe ratio of PL1/PL2.

In other words, if the UE that transmits a multi-slot long PUCCH usingthe beam1 and changes the beam into the beam2 and performs transmissionusing the same transmission power, assuming that a multi-slot long PUCCHslot number when the beam1 is transmitted is Y1, the Y2 value of amulti-slot long PUCCH slot number when transmission is performed usingthe beam2 may be determined to have a relation, such as Equation 12.

Y2=Y1×(PL1/PL2)   [Equation 12]

Skipping or Rate Matching Operation in Multi-Slot Long PUCCH

PUCCH symbol duration L and a PUCCH transmission period or acorresponding multi-slot long PUCCH slot number may be RRC configuredvalues (RRC configuration) or may be valued indicated or determinedthrough DCI among multiple RRC configured candidate values (RRCconfiguration+DCI indication).

In contrast, an actually available PUCCH symbol value La within aspecific PUCCH slot may be smaller than L due to a DL symbol or a gapperiod or other UL resources (e.g., short PUCCH, an SRS).

In such a case, the La value may be a value dynamically indicatedthrough DCI or may be a value determined by other dynamic parameter(s)transmitted through DCI.

For example, the La value may be a value indicated or determined by aslot format indicator (SFI) that notifies a UE of the type of slotthrough DCI.

Accordingly, this specification proposes an operation according to thefollowing method if PUCCH symbol duration La in which PUCCH transmissionis possible within a specific PUCCH slot dynamically determined due to aDL symbol or a gap period or other UL resources (e.g., short PUCCH, anSRS) is smaller than L in the state in which PUCCH symbol duration L anda PUCCH transmission period or a corresponding multi-slot long PUCCHslot number have been indicated/configured by the RRC configurationmethod or the RRC configuration+DCI indication method as describedabove.

(Method 1)

Method 1 is to skip PUCCH transmission in a corresponding slot.

In this method, an actually transmitted long PUCCH slot number isreduced as much as PUCCH transmission has been skipped compared to amulti-slot long PUCCH slot number configured by the RRC configuration orRRC configuration+DCI indication method.

(Method 2)

Method 2 is a method of skipping PUCCH transmission in a correspondingslot, but extending the number of skipped slots by incorporating it intothe set period or multi-slot long PUCCH slot number.

In this method, a multi-slot long PUCCH slot number configured by theRRC configuration or RRC configuration+DCI indication method and anactually transmitted long PUCCH slot number are the same.

(Method 3)

In Method 3, when PUCCH symbol duration La becomes P% or more of L orwhen (L-LA) is Q symbols or less, a PUCCH is transmitted incorresponding La symbol duration. When La is less than P% of L or when(L-LA) exceeds Q symbols, Method 1 or Method 2 is applied.

In other words, if actually available long PUCCH duration is reduced toQ symbols or less due to a dynamic configuration compared to long PUCCHduration L configured by the RRC configuration or RRC configuration+DCIindication method, a PUCCH is transmitted through rate-matching based onLa symbols. If not (i.e., when a difference between L and La is greaterthan the Q symbols), Method 1 or Method 2 is applied.

Furthermore, a PUCCH is transmitted through rate-matching based on Lasymbol duration only when Q symbols or less are not available if thefirst Q symbol or less or the last Q symbol or less or the first somesymbol and the last some symbol are added in L symbol locationsoriginally configured/indicated through RRC/DCI. If not, a method ofapplying Method 1 or Method 2 is also possible.

In the case of Method 3, a UCI coded bit may be punctured by (L-La)symbols in the state in which it has been generated based on L symbolsand mapped/transmitted or a UCI coded bit may be generated based on Lasymbols through rate-matching based on La symbols andmapped/transmitted.

In the above, a method of applying Method 1, 2 in the case of atime-domain OCC-based long PUCCH (e.g., for up to 2 bits) or a method ofapplying Method 1, 2, 3 in the case of a long PUCCH (e.g., for more than2 bits) not based on a time-domain OCC is possible.

In the above, the number of symbols L or La corresponding to the PUCCHsymbol duration may mean the total number of symbols of the sum of anUCI symbol and DMRS symbol configuring a PUCCH or may mean the number ofsymbols in which UCI is transmitted among symbols configuring a PUCCH.

In this case, a UE may have one of the methods configured from higherlayers and the UE may be indicated in spec so that it operates accordingto only one of the methods.

PUCCH Resource Configuration Method in Pre-DFT OCC-Based Long PUCCH

In the NR, in order to support large UCI payload and user multiplexingat the same time, a method of transmitting a long PUCCH based on apre-discrete Fourier transform (DFT) OCC may be considered.

In this case, the OCC means an orthogonal cover code used for userclassification, and may be a Walsh code or DFT sequence.

In this case, an OCC length in a pre-DFT-based long PUCCH may be set byconsidering a user multiplexing capacity to be supported and UCI payloadto be transmitted.

UCI payload that may be transmitted in the pre-DFT-based long PUCCH isin inverse proportion to an OCC length.

Accordingly, the OCC length may be flexibly set through higher layersignaling or dynamic indication through DCI by considering UCI payloadand a user multiplexing capacity.

Furthermore, for the coherent demodulation of a PUCCH, reference signal(RS) transmission for channel estimation is necessary for each UE.

In this case, the following method may be considered as an orthogonal RStransmission method for channel separation between users.

(Method 1)

This is a code division multiplexing (CDM) transmission method.

The CDM transmission method is a method of overlapping and transmitting(quasi-)orthogonal codes.

For example, if a PUCCH is transmitted in 1 RB, an RS for each UE may betransmitted the entire RB (sequence length=12).

In this case, orthogonal sequences may be different time domain cyclicshifts (CSs) in the same sequence.

(Method 2)

This is a frequency division multiplexing (FDM) transmission method.

The FDM transmission method is a transmission method using differentfrequency resources. Transmission may be performed by contiguouslyallocating frequency resources (contiguous FDM) or transmission may beperformed for each UE or in a manner crossing a comb form (comb typeFDM).

Hereinafter, some methods of defining the PUCCH resource of a pre-DFTOCC-based long PUCCH by considering the UCI and RS transmission methodsare proposed.

(Method 1)

Method of Defining PUCCH Resources by Pairing a UCI Part (OCC) and an RS

Method 1-A: Method of defining a PUCCH resource by pairing an OCC (UCI)and a comb index (RS)

A case where cross transmission of a comb form is used among FDM RStransmission methods is described as an example. If a length-N OCC hasbeen configured in a UCI part, assuming that the code index of each ofthe N OCCs is n (0<=n<N, n: integer), N PUCCH resources may beconfigured by pairing n and each of N RS combs {(0, N, 2N, . . . ), (1,N+1, 2N+1, . . . ), . . . (N−1, 2N−1, 3N-1, . . . )}.

Method 1-B: Method of defining PUCCH resources by pairing an OCC (UCI)and a contiguous FDM index (RS)

For example, if a length-N OCC has been configured in a UCI part and thenumber of subcarriers used for PUCCH transmission is N PUCCHs, assumingthat the code index of each of the N OCCs is n (0<=n<N, n: integer), NPUCCH resources may be configured by pairing n and each of N RS FDMs{(0, 1, 2, . . . ), (NPUCCHSC/N, NPUCCHSC/N+1, NPUCCHSC/N+2, . . . ), .. . (NPUCCHSC-NPUCCHSC/N, NPUCCHSC-NPUCCHSC/N+1, NPUCCHSC-NPUCCHSC/N+2,. . . )}.

Method 1-C: Method of defining PUCCH resources by pairing an OCC (UCI)and a CS (RS)

If an RS is classified based on a different CS among CDM RS transmissionmethods, if a length-N OCC has been configured in a UCI part, assumingthat the code index of each of the N OCCs is n (0<=n<N, n: integer), NPUCCH resources may be configured by pairing n and each of N CS indicesm (0<=m<N, m: integer).

If users are multiplexed, it is advantageous in terms of channelestimation as a DMRS CS distance between users increases. When pairingis performed as described above by considering such an advantage, CSs=0,3, 6, 9 may be defined to be paired with OCC code indices n=0, 1, 2, 3,respectively, with respect to an OCC length 4, and (n=0,1), CS=0,6 maybe paired in the case of an OCC length 2.

Method 1-D: Method of defining PUCCH resources by pairing an OCC (forUCI) and a combination of (comb type FDM, CS) (for RS)

For example, if a length-N OCC has been configured in a UCI part,assuming that the code index of each of the N OCCs is n (0<=n<N, n:integer), N PUCCH resources may be configured by pairing a code index napplied to UCI and N combinations of (comb, CS) for an RS configuration.

In this case, assuming that the number of combs configuring N RS indexcombinations is Ncomb and the number of CSs is Ncs, N=Ncomb×Ncs issatisfied.

For example, if N=4, (comb, CS) combinations corresponding to four RSindices may be configured (in this case, X>0) as (even subcarrier index,CS=0), (even subcarrier index, CS=X), (odd subcarrier index, CS=0), (oddsubcarrier index, CS=X).

Method 1-E: Method of defining PUCCH resource by pairing an OCC (forUCI) and a combination of (contiguous FDM, CS) (for RS)

For example, if a length-N OCC has been configured in an UCI part,assuming that the code index of each of the N OCCs is n (0<=n<N, n:integer), N PUCCH resources may be configured by pairing a code index napplied to UCI and N (contiguous FDM, CS) combinations for an RSconfiguration.

In this case, assuming that the number of contiguous FDMs configuring NRS index combinations is Nfdm and the number of CSs is Ncs, N=Nfdm×Ncsis satisfied.

For example, if N=4, (contiguous FDM, CS) combinations corresponding tofour RS indices may be configured (in this case, X>0) as (subcarrierindex 0˜NPUCCHSC/2−1, CS=0), (subcarrier index 0˜NPUCCHSC/2−1, CS=X),(subcarrier index NPUCCHSC/2˜NPUCCHSC−1, CS=0), (subcarrier indexNPUCCHSC/2˜NPUCCHSC−1, CS=X).

Method 1-A to Method 1-E are methods of generating N combinations bypreviously designating a 1-to-1 correspondence relation with respect toN UCI OCC indices and N RS indices (e.g., CS index, comb index,contiguous FDM index) or a combination of them.

In this case, the 1-to-1 correspondence relation of an OCC (UCI) and anRS may be fixed in spec as one of Methods 1-A˜E or may be configured asone of the methods through RRC signaling.

For example, this may be a form indicating whether a PUCCH resource hasbeen defined by pairing the comb index (Method 1-A) of an RS with an OCC(UCI) using RRC signaling 1 bit or whether a PUCCH resource has beendefined by pairing CS indices (Method 1-C) of an RS.

(Method 2)

Method 2 is a method of defining a UCI part and a combination of all RSsas PUCCH resources.

In other words, if Method 1 has made one RS index correspond to one OCCin, Method 2 is a method of defining PUCCH resources so that they can beselected by making all or multiple RSs correspond to one OCC.

For example, this is a method of defining PUCCH resources so that two RSindices correspond to one OCC so that the PUCCH resources are selected.

In this case, the two indices may be different comb indices or may bedifferent contiguous FDM indices or may be different CS indices.

Interference Randomization Method Between Cells in a Pre-DFT OCC-BasedLong PUCCH

Each symbol OCC is used to support multiplexing between users in thepre-DFT OCC-based long PUCCH transmission method.

If the OCC is used, orthogonality between users using different OCCcodes within the same cell is guaranteed, but interference between cellsmay still occur.

For example, the inter-cell interference may be interference between UEsusing the same OCC code of different cells.

Accordingly, this specification proposes that cell-specificsymbol-/hop-/slot-level OCC hopping is applied to a pre-DFT OCC-basedlong PUCCH for inter-cell interference randomization in such asituation.

In this case, the cycle of cell-specific OCC hopping may be a symbolunit or may be a frequency hop unit if frequency hopping has beenconfigured or may be hopping (inter-slot OCC hopping) of a slot unit.

Furthermore, in cell-specific symbol-/hop-/slot-level OCC hopping, OCChopping may be performed based on a random hopping pattern classifiedfor each cell.

In this case, in order to generate a special symbol-/hop-/slot-level OCChopping pattern for each cell, a random hopping pattern generationmethod derived by a physical cell ID or virtual cell ID may be used.

In addition, a configuration may be performed by higher layer signalingso that a physical cell ID and a virtual cell ID are selected asparameters used for the random hopping pattern generation method.

Furthermore, a UE may generate a cell-specific symbol-/hop-/slot-levelOCC hopping pattern without separate additional signaling through anallocated OCC index, symbol/hop/slot index, cell ID, etc., and maytransmit UCI information.

Furthermore, if cell-specific symbol-/hop-/slot-level OCC hopping isapplied to UCI in a pre-DFT OCC-based long PUCCH, a UE generates a PUCCHRS necessary for the channel estimation of a UCI transmission channelwith reference to the CS/comb index/contiguous FDM index of an RS pairedwith an OCC (UCI part) allocated thereto according to the “method ofdefining PUCCH resources by pairing a UCI part (OCC) and an RS.”

Alternatively, the UE may refer to the CS/comb index/contiguous FDMindex of an RS configured with respect to an OCC (UCI part) allocatedtherefor according to the “method of defining PUCCH resources by pairinga UCI part and a combination of all RSs.”

In this case, in the case of the RS, 1) the same one RS within a slot isconfigured and the corresponding RS may be determined to have beenpaired with a specific (e.g., first) symbol within a long PUCCH or anOCC used for a specific (e.g., first) frequency hop or 2) one RS isconfigured for each frequency hop and the corresponding RS may bedetermined to have been paired with a corresponding frequency hop or anOCCU used for a specific (e.g., first) symbol within the frequency hop.

In contrast, if an OCC (for UCI) and a CS/comb index/contiguous FDMindex (for RS) are previously paired and resources have been allocated,in order to perform inter-cell interference randomization, CS/combindex/contiguous FDM index (for RS) hopping is performed on an RS. A UEmay obtain OCC information to be applied to (paired) UCI throughcorresponding RS hopping information, and may apply the OCC informationto a UCI part.

Multi-Slot Long PUCCH Transmission Operation in a Dynamic TDD Situation

Hereinafter, an operation of transmitting a long PUCCH using amulti-slot in a dynamic time division duplex (TDD) situation isdescribed.

In this case, the operation of transmitting a long PUCCH using multipleslots may include an operation of repeatedly transmitting a long PUCCHin multiple slots.

In this specification, TDD may be referred to as an unpaired spectrum orframe structure type 2, and frequency division duplex (FDD) may bereferred to as a paired spectrum or frame structure type 1.

Hereinafter, the transmission of a long PUCCH using multiple slots isbriefly expressed as a “multi-slot long PUCCH.”

The NR is dynamically adapted in response to a change in the amount ofuplink (UL) traffic and/or downlink (DL) traffic, and may supportdynamic TDD in order to efficiently support TDD between differentservices (e.g., low latency service, high data rate service).

In this case, as a method of supporting dynamic TDD, a DL slot, an ULslot, an unknown slot, a reserved slot may be configured semi-staticallyor dynamically.

In this case, the “reserved slot” is a slot TDDed with another system orused for a gNB for other specific uses other than the DL and/or UL datatransmission of NR, and may be a slot in which the UL and/or DL datatransmission of NR is not permitted.

Furthermore, the “unknown slot” may be used for an object basicallyidentical with or similar to the reserved slot.

In this case, the “unknown slot” is a slot through which a gNB supportsdynamic DL and/or UL transmission if necessary, and means a slot capableof overriding a slot format.

In this case, a slot format, such as a DL/UL/unknown slot, may beconfigured by a gNB semi-static or dynamically.

A slot format configured as described above may be indicated by asemi-static slot format indicator (SFI) (in the case of a semi-staticconfiguration) or a dynamic SFI (in the case of a dynamic configuration)with respect to a UE.

Furthermore, the reserved slot may be semi-statically configured by agNB and may be indicated through semi-static RRC signaling with respectto a UE.

In this case, the DL/UL/unknown/reserved may have been configured in asymbol unit semi-statically or dynamically.

In this case, when a multi-slot long PUCCH is transmitted in N slots,the transmission duration of a multi-slot long PUCCH is configured by astating slot and the number of slots. In such a semi-static and/ordynamic TDD situation, a multi-slot long PUCCH may operate according tothe following methods (Option 1-1 to Option 1-2).

(Option 1-1)

Option 1-1 is a method of transmitting the first slot of a multi-slotlong PUCCH in a slot designated as a starting slot (UL or regardless ofunknown) and transmitting a subsequent (N−1) slot(s) only in a slotconfigured as UL through a semi-static SFI (or a dynamic SFI).

More specifically, the subsequent (N−1) slot(s) may be transmitted onlyin a slot configured as UL by a semi-static SFI or may be transmitted ina slot configured as UL by a semi-static SFI and additionally a slotconfigured as UL by a dynamic SFI.

In this case, the subsequent (N−1) slot(s) means slots in which themulti-slot long PUCCH is transmitted.

(Option 1-2)

Option 1-2 is a method of transmitting the first slot of a multi-slotlong PUCCH in a slot designated as a starting slot (UL or regardless ofunknown) and then transmitting (N−1) slots only in a slot configured asUL or unknown by a semi-static SFI (or a dynamic SFI).

More specifically, the subsequent (N−1) slot(s) may be transmitted onlyin a slot configured as UL by a semi-static SFI or may be transmitted ina slot configured as UL by a semi-static SFI and additionally a slotconfigured as UL by a dynamic SFI.

In this case, in Option 1-1, 1-2, the first slot transmission may bevalid only when the starting slot is configured as unknown or UL througha semi-static SFI (or a dynamic SFI).

In the above, the meaning that a “specific slot has been configured asUL” may mean that all symbols or most of symbols PUCCH transmissionduration within a corresponding slot have been configured as UL.

Alternatively, in the above, the meaning that a “specific slot has beenconfigured as UL” may be limited to a case where the number of uplinksymbols which may be used for PUCCH transmission within a slot isgreater than or equal to configured PUCCH duration (in symbols).

In this case, when the number of uplink symbols which may be used forPUCCH transmission within a slot is smaller than the configured PUCCHduration (in symbols), a corresponding slot may be determined to be notUL or unknown and may operate.

In this case, if DL/UL/unknown/reserved is configured in a symbol unit,the number of uplink symbols may include counting only an UL symbol ormay include an UL symbol and unknown symbols.

Furthermore, if some of PUCCH duration (in symbols) configured for PUCCHtransmission within a slot is not an UL symbol, the corresponding slotmay be determined to be not UL or unknown and operate.

For example, if a difference between PUCCH duration (in symbols)configured for PUCCH transmission within a slot and an UL symbol exceeds1 symbol, the corresponding slot may be determined to be not UL orunknown and operate.

Alternatively, if duration configured with contiguous uplink symbolswhich may be used for PUCCH transmission does not fully include durationaccording to a configured PUCCH starting symbol index and PUCCH duration(in symbols), a corresponding slot may be determined to be not UL orunknown and operate.

Alternatively, if a starting slot in which a multi-slot long PUCCH istransmitted has not been configured as UL through a semi-static SFI (ora dynamic SFI) or UL or unknown, a corresponding slot may operateaccording to the following methods (Option 2-1 to Option 2-2).

(Option 2-1)

Option 2-1 is a method of transmitting a multi-slot long PUCCH only in Nslots configured as UL through a semi-static SFI (or a dynamic SFI)among subsequent slots including a slot designated as a starting slot.

More specifically, a multi-slot long PUCCH may be transmitted only in aslot configured as UL by a semi-static SFI among subsequent slotsincluding a slot designated as a starting slot or may be transmitted ina slot configured as UL by a semi-static SFI and additionally a slotconfigured as UL by a dynamic SFI.

(Option 2-2)

Option 2-2 is a method of transmitting a multi-slot long PUCCH in Nslots configured as UL or unknown through a semi-static SFI (or adynamic SFI) among subsequent slots including a slot designated as astarting slot.

More specifically, a multi-slot long PUCCH may be transmitted only in aslot configured as UL by a semi-static SFI among subsequent slotsincluding a slot designated as a starting slot or may be transmitted ina slot configured as UL by a semi-static SFI and additionally a slotconfigured as UL by a dynamic SFI.

In this case, the meaning that a specific slot has been configured as ULmay mean that all symbols or most of symbols in PUCCH transmissionduration within a corresponding slot have been configured as UL.

Alternatively, the meaning that a specific slot has been configured asUL may be limited to a case where the number of uplink symbols which maybe used for PUCCH transmission within a slot is greater than or equal toconfigured PUCCH duration (in symbols).

In this case, when the number of uplink symbols which may be used forPUCCH transmission within a slot is greater than the configured PUCCHduration (in symbols), the corresponding slot may be determined to benot UL or unknown and operate.

Furthermore, if DL/UL/unknown/reserved is configured in a symbol unit,the number of uplink symbols may include counting only an UL symbol ormay include an UL symbol and unknown symbols.

Furthermore, if some of PUCCH duration (in symbols) configured for PUCCHtransmission within a slot is not an UL symbol, a corresponding slot maybe determined to be not UL or unknown and operate.

For example, if a difference between PUCCH duration (in symbols)configured for PUCCH transmission within a slot and an UL symbol is 1 orexceeds a symbol, the corresponding slot may be determined to be not ULor unknown and operate.

Alternatively, if duration configured a contiguous uplink symbols whichmay be used for PUCCH transmission does not fully include durationaccording to a configured PUCCH starting symbol index and PUCCH duration(in symbols), a corresponding slot may be determined to be not UL orunknown and operate.

A specific method may be configured semi-statically or dynamically insuch a way as to operate according to one of the above-described fouroptions.

For example, which one of the four options will be applied, which methodof Options 1-1 and 1-2 will be applied or which method of Options 2-1and 2-2 will be applied may be dynamically indicated through DCIindicating PUCCH transmission with respect to a UE.

The multi-slot long PUCCH may skip PUCCH transmission with respect to aslot configured as DL and/or reserved through a semi-static SFI (or adynamic SFI).

In this case, the omitted slot may be counted as one of N slotsallocated for PUCCH transmission or may not be counted.

As described above, in multi-slot long PUCCH transmission in FDD/TDD (orpaired/unpaired spectrum), a slot to be actually transmitted may bedetermined by the following steps.

In this case, the number of transmission slots configured in acorresponding multi-slot long PUCCH may be set as N, and a transmissionsymbol region within the transmission slot may be configured (orindicated) as K symbols from a symbol #K1.

(Step 1)

In a first step (step 1) of determining a slot for multi-slot long PUCCHtransmission, in the case of a semi-static DL/UL configuration, N slotsconfigured with a slot in which K UL symbols from a symbol #K1 have beenconfigured as unknown or UL are determined to be multi-slot long PUCCHtransmission slots.

For example, if a multi-slot long PUCCH is indicated (or configured)during 4 slots from a slot #0 and K1=5, K=6 is indicated (orconfigured), when slots #0/#1/#2/#3/#4/#5/#6 are configured as a DLsymbol/all DL symbols/10 DL symbols+four unknown symbols/all unknownsymbols/all UL symbols/all UL symbols/all UL symbols by a semi-staticDL/UL configuration, slots #3/#4/#5/#6 may be determined ascorresponding multi-slot long PUCCH transmission slots.

(Step 2)

Next, in a second step (step 2) of determining a slot for multi-slotlong PUCCH transmission, in the case of a dynamic SFI (or groupcommon-PDCCH) configuration, a DL/unknown/UL region may be signaled withrespect to a symbol (or slot) configured as unknown by a semi-staticDL/UL configuration (or if a semi-static DL/UL configuration has notbeen configured).

That is, if a dynamic SFI is configured and K UL symbols from a symbol#K1 has not been configured as UL (and/or unknown) with respect to acorresponding slot indicated by a dynamic SFI among slots determined formulti-slot long PUCCH transmission in Step 1 (in particular, slotsconfigured as unknown by a semi-static DL/UL configuration), long PUCCHtransmission may not be performed on a corresponding slot.

Furthermore, if a dynamic SFI has been configured, but dynamic SFIinformation about slots determined for multi-slot long PUCCHtransmission in Step 1 (in particular, slots configured as unknown by asemi-static DL/UL configuration) has not been received, long PUCCHtransmission may not be performed on a corresponding slot and a rule inwhich long PUCCH transmission is performed on the corresponding slot maybe configured.

In this case, in the case of a multi-slot long PUCCH (or multi-slotPUSCH) indicated by dynamic L1 signaling (e.g., DL assignment, ULgrant), multi-slot long PUCCH (or multi-slot PUSCH) transmission may beperformed during N slots by applying only Step 1 without applying Step2.

Furthermore, in the case of a multi-slot long PUCCH (e.g., schedulingrequest, periodic CSI transmission or multi-slot PUSCH) indicated by RRCsignaling (or a combination of RRC signaling and DCI, e.g.,semi-persistent transmission), multi-slot long PUCCH (or multi-slotPUSCH) transmission may be omitted in some of N slots by applying bothStep 1 and Step 2.

Alternatively, in UCI transmission, multi-slot long PUCCH transmissionmay be performed during N slots by always applying only Step 1 withoutapplying Step 2 regardless of trigger means (whether it is L1 signalingor RRC signaling).

More specifically, in (multi-slot) data transmission not including UCI,(multi-slot) PUSCH transmission may be omitted in some of N slots byapplying both Step 1 and Step 2.

The multi-slot long PUCCH transmission operation in the dynamic TDDsituation may be identically applied to a multi-slot PUSCH transmissionoperation of transmitting a PUSCH in multiple slots for uplink coverageextension.

Multi-Slot PDSCH Reception Operation in a Dynamic TDD Situation

Furthermore, the multi-slot long PUCCH transmission operation may beapplied to multi-slot PDSCH transmission in which a PDSCH is transmittedin multiple slots for downlink coverage extension as follows.

(Option 1-1)

The first slot of a multi-slot PDSCH is transmitted in a slot designatedas a starting slot (DL or regardless of unknown), and subsequent (N−1)slots are transmitted only in a slot configured as DL through asemi-static SFI (or a dynamic SFI).

In addition, the subsequent (N−1) slots may be transmitted only in aslot configured as DL by a semi-static SFI or may be transmitted in aslot configured as DL by a semi-static SFI and additionally a slotconfigured as DL by a dynamic SFI.

(Option 1-2)

The first slot of a multi-slot PDSCH is transmitted in a slot designatedas a starting slot (DL or regardless of unknown), and subsequent (N−1)slots are transmitted only in a slot configured as DL or unknown througha semi-static SFI (or a dynamic SFI).

In addition, the subsequent (N−1) slots may be transmitted only in aslot configured as DL by a semi-static SFI or may be transmitted in aslot configured as DL by a semi-static SFI and additionally a slotconfigured as DL by a dynamic SFI.

In this case, the first slot transmission may be valid only when thestarting slot is configured as unknown or DL through a semi-static SFI(or a dynamic SFI).

In this case, the meaning that a specific slot has been configured as DLmay mean that all symbol or most of symbols in PDSCH transmissionduration within the corresponding slot have been configured as DL.

Alternatively, in the above, the meaning that a specific slot has beenconfigured as DL may be limited to a case where the number of DL symbolswhich may be used for PDSCH transmission within the slot is greater thanor equal to configured PDSCH duration (in symbols).

In this case, when the number of DL symbols which may be used for PDSCHtransmission within the slot is smaller than the configured PDSCHduration (in symbols), the corresponding slot may be determined to benot DL or unknown and operate.

Furthermore, if DL/UL/unknown/reserved is configured in a symbol unit,the number of DL symbols may include counting only a DL symbol or mayinclude a DL symbol and unknown symbols.

Furthermore, if some of PDSCH duration (in symbols) configured for PDSCHtransmission within a slot is not a DL symbol, the corresponding slotmay be determined to be not DL or unknown and operate.

For example, if a difference between PDSCH duration (in symbols)configured for PDSCH transmission within a slot and a DL symbol is 1 orexceeds a symbol, the corresponding slot may be determined to be not DLor unknown and operate.

Alternatively, if a starting slot has not been configured as DL througha semi-static SFI (or a dynamic SFI) or DL or unknown, it may operateaccording to the following method.

(Option 2-1)

A multi-slot PDSCH is transmitted only in N slots configured as DLthrough a semi-static SFI (or a dynamic SFI) among subsequent slotsincluding a slot designated as a starting slot.

In addition, a multi-slot PDSCH may be transmitted only in a slotconfigured as DL by a semi-static SFI among subsequent slots including aslot designated as a starting slot or may be transmitted in a slotconfigured as DL by a semi-static SFI and additionally a slot configuredas DL by a dynamic SFI.

(Option 2-2)

A multi-slot PDSCH is transmitted only in N slots configured as DL orunknown through a semi-static SFI (or a dynamic SFI) among subsequentslots including a slot designated as a starting slot.

In addition, a multi-slot PDSCH may be transmitted only in a slotconfigured as DL by a semi-static SFI among subsequent slots including aslot designated as a starting slot or may be transmitted in a slotconfigured as DL by a semi-static SFI and additionally a slot configuredas DL by a dynamic SFI.

In this case, the meaning that a specific slot has been configured as DLmay mean that all symbols or most of symbols in PDSCH transmissionduration within a corresponding slot have been configured as DL.

Alternatively, the meaning that a specific slot has been configured asDL may be limited to a case where the number of DL symbols which may beused for PDSCH transmission within the slot is greater than or equal toconfigured PDSCH duration (in symbols).

In this case, when the number of DL symbols which may be used for PDSCHtransmission within the slot is smaller than the configured PDSCHduration (in symbols), the corresponding slot may be determined to benot DL or unknown and operate.

Furthermore, if DL/UL/unknown/reserved is configured in a symbol unit,the number of DL symbols may include counting only a DL symbol or mayinclude a DL symbol and unknown symbols.

Furthermore, if some of PDSCH duration (in symbols) configured for PDSCHtransmission within a slot is not a DL symbol, the corresponding slotmay be determined to be not DL or unknown and operate.

For example, when a difference between PDSCH duration (in symbols)configured for PDSCH transmission within a slot and a DL symbol is 1 orexceeds a symbol, the corresponding slot may be determined to be not DLor unknown and operate.

In this case, the corresponding slot may be configured semi-staticallyor dynamically in such a way as to operate according to one of theoptions.

For example, which method of the four options will be applied or whichmethod of Options 1-1 and 1-2 will be applied or which method of Options2-1 and 2-2 will be applied may be dynamically indicated through DCIthat schedules a PDSCH.

The multi-slot PDSCH may skip PDSCH transmission in a slot configured asUL and/or reserved through a semi-static SFI (or a dynamic SFI).

The omitted slot may be counted as one of N slots allocated for PDSCHtransmission or may not be counted.

The PDSCH transmission may mean a PDSCH reception operation from theviewpoint of a UE.

Furthermore, the multi-slot PDSCH reception operation in the dynamic TDDsituation may be identically applied to a multi-slot PDCCH transmissionoperation of transmitting a PDCCH in multiple slots for downlinkcoverage extension.

Frequency Hopping Operation of Multi-Slot Long PUCCH in a Dynamic TDDSituation

When a PUCCH is repeatedly transmitted in multiple slots for thecoverage improvement of the PUCCH, inter-slot frequency hopping may beapplied in order to obtain frequency diversity additionally in additionto the repetition gain.

Inter-slot frequency hopping refers to an operation of changing thelocation of frequency resources transmitted every slot in order toobtain frequency diversity.

A random frequency hopping method and a deterministic method arepossible for such inter-slot frequency hopping.

The random frequency hopping method is to generate a frequency hoppingpattern through a random number generator every slot.

In addition, the deterministic frequency hopping method may beimplemented by determining multiple frequency locations and moving toone of the determined frequency locations every slot, for example.

For simple example, after two frequency resources f1 and f2 areconfigured through higher layer and/or L1 signaling, an alternativemovement to f1 and f2 may be performed every slot.

In this case, a frequency hopping pattern of inter-slot frequencyhopping may be defined as the function of a slot index.

Hereinafter, this specification proposes an inter-slot frequency hoppingmethod.

In this hopping method, what a slot capable of PUCCH transmission indynamic TDD has been limited and may be changed semi-statically ordynamically has been taken into consideration.

First, in the following proposal, the meaning that a specific slot hasbeen configured as UL complies with the definition of Paragraph 3.5(Multi-slot long PUCCH transmission operation in Dynamic TDD situation).

Furthermore, the meaning that PUCCH transmission is skipped hereinaftermeans that a PUCCH is considered to have been transmitted and counted amulti-slot long PUCCH transmission number.

Furthermore, the meaning that PUCCH transmission is held (or deferred)hereinafter means that it is not counted as a multi-slot long PUCCHtransmission number.

(Method 1)

A new frequency hopping pattern is generated every slot index ns.

In this case, the slot index ns means an index counted regardless of aslot format (UL/DL/unknown/reserved).

In the case of Method 1, with respect to a slot not configured as UL,PUCCH transmission is skipped or held (or deferred), but a frequencyhopping pattern is generated regardless of a slot format. In this case,application in the corresponding slot is skipped.

That is, the frequency hopping pattern is generated in all slots, but agenerated value is not applied to actual frequency hopping.

Thereafter, when PUCCH transmission is started again in a slotconfigured as UL, a frequency hopping pattern value newly generatedusing a corresponding slot index is applied.

In Method 1, for example, in the case of the f1 and f2 frequencyhopping, if only an even or odd slot is configured as UL, a frequencydiversity gain may not be sufficiently obtained because a PUCCH istransmitted using the f1 or f2 value.

(Method 2)

This is a method of generating a new frequency hopping pattern every ULslot index.

In this case, the UL slot index “ns_u” means an index that counts only aslot configured as UL.

In Method 2, with respect to a case where PUCCH transmission is skippedor held (or deferred) with respect to the slot not configured as UL, thegeneration of a frequency hopping pattern is also held (or deferred)because a corresponding UL slot index does not increase.

A difference between Method 1 and Method 2 is as follows.

For example, in the f1, f2 frequency hopping, Method 2 can obtain thesame frequency diversity gain as that in the case where all slots havebeen configured UL because a frequency hopping pattern of anf1→f2→f1→f2→, . . . form is maintained although only an even or odd slothas been configured as UL.

(Method 3)

This is a method of generating a frequency hopping pattern based on anUL slot index based on a semi-static slot format configuration.

In this case, the UL slot index “ns_u_ss” means an index that countsonly a slot configured as UL by a semi-static slot format configuration.

In Method 3, after a frequency hopping pattern is generated based on asemi-static UL/DL configuration as in Method 2, when some of slotspreviously configured as UL is changed into DL by a dynamic SFI (e.g.,when an unknown slot capable of UL transmission is designated by DCI forDL transmission use), the application of a frequency hopping pattern isskipped.

FIG. 5 is a flowchart showing an example of an operation method of a UEfor transmitting a long PUCCH using multiple slots, which is proposed inthis specification.

First, the UE receives first information about a time division duplex(TDD) uplink (UL)-downlink (DL) slot configuration from a base station(S510).

Furthermore, the UE receives second information, including a firstparameter indicating the number of slots used for a transmission of thelong PUCCH and a second parameter indicating a duration of a PUCCHsymbol within a PUCCH slot, from the base station (S520).

Furthermore, the UE determines the multiple slots for transmitting thelong PUCCH based on the first information and the second information(S530).

The multiple slots for transmitting the long PUCCH may be determined tobe a specific number of slots from a configured starting slot.

The specific number of slots may be configured with an UL slot or anunknown slot. Alternatively, the specific number of slots may include anUL slot or an unknown slot.

The UL slot may mean a slot in which the number of UL symbols availablefor the transmission of the long PUCCH within the slot is greater thanor equal to the second parameter.

Furthermore, the UE transmits the long PUCCH to the base station on themultiple slots (S540).

If, the number of UL symbols available for the transmission of the longPUCCH within a specific slot of the determined slots is smaller than thesecond parameter, the long PUCCH may not be transmitted on the specificslot.

Additionally, the UE may receive a slot format indicator (SFI) forproviding notification of a specific TDD UL-DL slot format from the basestation after step S510.

Furthermore, the long PUCCH may be transmitted using a pre-discreteFourier transform (DFT) orthogonal cover code (OCC).

More specifically, the long PUCCH resource may be determined by pairingan OCC related to an uplink control information (UCI) part and a cyclicshift (CS) related to a reference signal.

Contents in which a transmission of the long PUCCH is implemented in aUE device, which are proposed in this specification, are described withreference to FIGS. 5 and 7 to 10.

In a wireless communication system, a UE that transmits a long physicaluplink control channel (PUCCH) using multiple slots may include a radiofrequency (RF) module for transmitting and receiving radio signals and aprocessor functionally connected to the RF module.

First, the processor of the UE controls the RF module to receive firstinformation about a time division duplex (TDD) uplink (UL)-downlink (DL)slot configuration from a base station.

Furthermore, the processor controls the RF module to receive secondinformation, including a first parameter indicating the number of slotsused for a transmission of the long PUCCH and a second parameterindicating a duration of a PUCCH symbol within a PUCCH slot, from thebase station.

Furthermore, the processor determines the multiple slots fortransmitting the long PUCCH based on the first information and thesecond information.

The multiple slots for transmitting the long PUCCH may be determined asa specific number of slots from a configured starting slot.

The specific number of slots may be configured with an UL slot or anunknown slot. Alternatively, the specific number of slots may include anUL slot or an unknown slot.

The UL slot may mean a slot in which the number of UL symbols availablefor PUCCH transmission within the slot is greater than or equal to thesecond parameter.

Furthermore, the processor controls the RF module to transmit the longPUCCH to the base station on the multiple slots.

If, the number of UL symbols available for the transmission of the longPUCCH within a specific slot of the determined slots is smaller than thesecond parameter, the long PUCCH using multiple slots may not betransmitted on the specific slot.

Additionally, the processor may control the RF module to receive a slotformat indicator (SFI) for providing notification of a specific TDDUL-DL slot format from the base station.

Furthermore, the long PUCCH may be transmitted using a pre-discreteFourier transform (DFT) orthogonal cover code (OCC).

More specifically, the long PUCCH resource may be determined by pairingan OCC related to an uplink control information (UCI) part and a cyclicshift (CS) related to a reference signal.

FIG. 6 is a flowchart showing an example of an operation method of abase station for receiving a long PUCCH using multiple slots, which isproposed in this specification.

First, the base station transmits first information about a timedivision duplex (TDD) uplink (UL)-downlink (DL) slot configuration to aUE (S610).

Furthermore, the base station transmits second information, including afirst parameter indicating the number of multiple slots used for atransmission of the long PUCCH and a second parameter indicating aduration of a PUCCH symbol within a PUCCH slot, to the UE (S620).

Furthermore, the base station receives a long PUCCH from the UE onmultiple slots (S630).

The multiple slots may be determined to be a specific number of slotsfrom a configured starting slot.

The specific number of slots may be configured with an UL slot or anunknown slot. Alternatively, the specific number of slots may include anUL slot or an unknown slot.

The UL slot may mean a slot in which the number of UL symbols availablefor the transmission of the long PUCCH within a slot is greater than orequal to the second parameter.

When the number of UL symbols available for the transmission of the longPUCCH within a specific slot of determined slots is smaller than thesecond parameter, the long PUCCH may not be received on the specificslot.

Additionally, the base station may transmit a slot format indicator(SFI) for providing notification of a specific TDD UL-DL slot format tothe UE after step S610.

Furthermore, the long PUCCH may be received using a pre-discrete Fouriertransform (DFT) orthogonal cover code (OCC).

More specifically, the long PUCCH resource may be determined by pairingan OCC related to an uplink control information (UCI) part and a cyclicshift (CS) related to a reference signal.

Contents in which the reception of a long PUCCH using multiple slotsproposed in this specification with reference to FIGS. 6 to 10 isimplemented in a base station apparatus are described.

In a wireless communication system, a base station that receives a longphysical uplink control channel (PUCCH) using multiple slots may includea radio frequency (RF) module for transmitting and receiving radiosignals and a processor functionally connected to the RF module.

First, the processor of the base station controls the RF module totransmit first information about a time division duplex (TDD) uplink(UL)-downlink (DL) slot configuration to a UE.

Furthermore, the processor controls the RF module to transmit secondinformation, including a first parameter indicating the number of slotsused for a transmission of the long PUCCH and a second parameterindicating a duration of PUCCH symbol within a PUCCH slot, to the UE.

Furthermore, the base station controls the RF module to receive a longPUCCH over multiple slots.

The multiple slots may be determined to be a specific number of slotsfrom a configured starting slot.

The specific number of slots may be configured with an UL slot or anunknown slot. Alternatively, the specific number of slots may include anUL slot or an unknown slot.

The UL slot may mean a slot in which the number of UL symbols availablefor the transmission of the long PUCCH within a slot is greater than orequal to the second parameter.

When the number of UL symbols available for the transmission of the longPUCCH within a specific slot of multiple slots is smaller than thesecond parameter, the long PUCCH may not be received on the specificslot.

Additionally, the processor may control the RF module to transmit a slotformat indicator (SFI) for providing notification of a specific TDDUL-DL slot format to the UE.

Furthermore, the long PUCCH may be received using a pre-discrete Fouriertransform (DFT) orthogonal cover code (OCC).

More specifically, the long PUCCH resource may be determined by pairingan OCC related to an uplink control information (UCI) part and a cyclicshift (CS) related to a reference signal.

The above-described methods may be independently performed or may becombined in various ways and performed to perform atransmission/reception of the long PUCCH using multiple slots proposedin this specification.

Overview of Devices to Which Present Invention is Applicable

FIG. 7 illustrates a block diagram of a wireless communication device towhich methods proposed in this specification may be applied.

Referring to FIG. 7, a wireless communication system includes a basestation 710 and multiple user equipments 720 positioned within an areaof the base station.

Each of the BS and the UE may be expressed as a wireless device.

The BS 710 includes a processor 711, a memory 712, and a radio frequency(RF) module 713.

The processor 711 implements a function, a process, and/or a methodwhich are proposed in FIGS. 1 to 6 above.

Layers of a radio interface protocol may be implemented by theprocessor.

The memory is connected with the processor to store various informationfor driving the processor.

The RF module is connected with the processor to transmit and/or receivea radio signal.

The UE includes a processor 721, a memory 722, and an RF module 723.

The processor implements a function, a process, and/or a method whichare proposed in FIGS. 1 to 6 above.

Layers of a radio interface protocol may be implemented by theprocessor.

The memory 722 is connected with the processor to store variousinformation for driving the processor.

The RF module 723 is connected with the processor to transmit and/orreceive a radio signal.

The memories 712 and 722 may be positioned inside or outside theprocessors 711 and 721 and connected with the processor by variouswell-known means.

Further, the base station and/or the UE may have a single antenna ormultiple antennas.

FIG. 8 illustrates a block diagram of a communication device accordingto an embodiment of the present invention.

In particular, FIG. 8 is a diagram more specifically illustrating the UEof FIG. 7 above.

Referring to FIG. 8, the UE may be configured to include a processor (ora digital signal processor (DSP) 810, an RF module (or RF unit) 835, apower management module 805, an antenna 840, a battery 855, a display815, a keypad 820, a memory 830, a subscriber identification module(SIM) card 825 (This component is optional), a speaker 845, and amicrophone 850. The UE may also include a single antenna or multipleantennas.

The processor 810 implements a function, a process, and/or a methodwhich are proposed in FIGS. 1 to 6 above. Layers of a radio interfaceprotocol may be implemented by the processor.

The memory 830 is connected with the processor and stores informationrelated with an operation of the processor. The memory 830 may bepositioned inside or outside the processor and connected with theprocessor by various well-known means.

A user inputs command information such as a telephone number or the likeby, for example, pressing (or touching) a button on the keypad 820 or byvoice activation using the microphone 850. The processor receives suchcommand information and processes to perform appropriate functionsincluding dialing a telephone number. Operational data may be extractedfrom the SIM card 825 or the memory 830. In addition, the processor maydisplay command information or drive information on the display 815 forthe user to recognize and for convenience.

The RF module 835 is connected with the processor to transmit and/orreceive an RF signal. The processor transfers the command information tothe RF module to initiate communication, for example, to transmit radiosignals constituting voice communication data. The RF module isconstituted by a receiver and a transmitter for receiving andtransmitting the radio signals. The antenna 840 functions to transmitand receive the radio signals. Upon receiving the radio signals, the RFmodule may transfer the signal for processing by the processor andconvert the signal to a baseband. The processed signal may be convertedinto to audible or readable information output via the speaker 845.

FIG. 9 is a diagram illustrating an example of an RF module of thewireless communication device to which the method proposed in thisspecification may be applied.

Specifically, FIG. 9 illustrates an example of an RF module that may beimplemented in a frequency division duplex (FDD) system.

First, in a transmission path, the processors described in FIGS. 7 and 8process the data to be transmitted and provide an analog output signalto the transmitter 910.

Within the transmitter 910, the analog output signal is filtered by alow pass filter (LPF) 911 to remove images caused by a digital-to-analogconversion (ADC) and up-converted to an RF from a baseband by anup-converter (mixer) 912, and amplified by a variable gain amplifier(VGA) 913 and the amplified signal is filtered by a filter 914,additionally amplified by a power amplifier (PA) 915, routed through aduplexer(s) 950/an antenna switch(es) 960, and transmitted through anantenna 970.

In addition, in a reception path, the antenna 970 receives signals fromthe outside and provides the received signals, which are routed throughthe antenna switch(es) 960/duplexers 950 and provided to a receiver 920.

In the receiver 920, the received signals are amplified by a low noiseamplifier (LNA) 923, filtered by a bans pass filter 924, anddown-converted from the RF to the baseband by a down-converter (mixer)925.

The down-converted signal is filtered by a low pass filter (LPF) 1426and amplified by a VGA 927 to obtain an analog input signal, which isprovided to the processors described in FIGS. 7 and 8.

Further, a local oscillator (LO) generator 940 also provides transmittedand received LO signals to the up-converter 912 and the down-converter925, respectively.

In addition, a phase locked loop (PLL) 930 receives control informationfrom the processor to generate the transmitted and received LO signalsat appropriate frequencies and provides control signals to the LOgenerator 940.

Further, circuits illustrated in FIG. 9 may be arranged differently fromthe components illustrated in FIG. 9.

FIG. 10 is a diagram illustrating another example of the RF module ofthe wireless communication device to which the method proposed in thisspecification may be applied.

Specifically, FIG. 10 illustrates an example of an RF module that may beimplemented in a time division duplex (TDD) system.

A transmitter 1010 and a receiver 1020 of the RF module in the TDDsystem are identical in structure to the transmitter and the receiver ofthe RF module in the FDD system.

Hereinafter, only the structure of the RF module of the TDD system thatdiffers from the RF module of the FDD system will be described and thesame structure will be described with reference to a description of FIG.9.

A signal amplified by a power amplifier (PA) 1015 of the transmitter isrouted through a band select switch 1050, a band pass filter (BPF) 1560,and an antenna switch(es) 1070 and transmitted via an antenna 1080.

In addition, in a reception path, the antenna 1080 receives signals fromthe outside and provides the received signals, which are routed throughthe antenna switch(es) 1070, the band pass filter 1060, and the bandselect switch 1050 and provided to the receiver 1020.

In the embodiments described above, the components and the features ofthe present invention are combined in a predetermined form. Eachcomponent or feature should be considered as an option unless otherwiseexpressly stated. Each component or feature may be implemented not to beassociated with other components or features. Further, the embodiment ofthe present invention may be configured by associating some componentsand/or features. The order of the operations described in theembodiments of the present invention may be changed. Some components orfeatures of any embodiment may be included in another embodiment orreplaced with the component and the feature corresponding to anotherembodiment. It is apparent that the claims that are not expressly citedin the claims are combined to form an embodiment or be included in a newclaim by an amendment after the application.

The embodiments of the present invention may be implemented by hardware,firmware, software, or combinations thereof. In the case ofimplementation by hardware, according to hardware implementation, theexemplary embodiment described herein may be implemented by using one ormore application specific integrated circuits (ASICs), digital signalprocessors (DSPs), digital signal processing devices (DSPDs),programmable logic devices (PLDs), field programmable gate arrays(FPGAs), processors, controllers, micro-controllers, microprocessors,and the like.

In the case of implementation by firmware or software, the embodiment ofthe present invention may be implemented in the form of a module, aprocedure, a function, and the like to perform the functions oroperations described above. A software code may be stored in the memoryand executed by the processor. The memory may be positioned inside oroutside the processor and may transmit and receive data to/from theprocessor by already various means.

This specification has an effect in that it can extend coverage bytransmitting a PUCCH using a plurality of slots in a dynamic TDDsituation.

Furthermore, this specification has an effect in that it can supportmultiple users and big UCI payload by transmitting a PUCCH based on apre-DFT OCC.

It is apparent to those skilled in the art that the present inventionmay be embodied in other specific forms without departing from essentialcharacteristics of the present invention. Accordingly, theaforementioned detailed description should not be construed asrestrictive in all terms and should be exemplarily considered. The scopeof the present invention should be determined by rational construing ofthe appended claims and all modifications within an equivalent scope ofthe present invention are included in the scope of the presentinvention.

An example is applied to the 3GPP LTE/LTE-A/NR system is describedprimarily, but it is possible to apply the RRC connection method tovarious wireless communication systems in addition to the 3GPPLTE/LTE-A/NR system.

What is claimed is:
 1. A method of transmitting, by a user equipment(UE), a long physical uplink control channel (PUCCH) using multipleslots in a wireless communication system, the method comprising:receiving, from a base station, first information for a time divisionduplex (TDD) uplink (UL)-downlink (DL) slot configuration; receiving,from the base station, second information including a first parameterfor a number of slots used for a transmission of the long PUCCH and asecond parameter for a duration of a PUCCH symbol within a PUCCH slot;determining the multiple slots for transmitting the long PUCCH based onthe first information and the second information; and transmitting, tothe base station, the long PUCCH over the multiple slots.
 2. The methodof claim 1, wherein the multiple slots for transmitting the long PUCCHis determined to be a specific number of slots from a configuredstarting slot.
 3. The method of claim 2, wherein the specific number ofslots is configured with an UL slot or an unknown slot.
 4. The method ofclaim 3, wherein a number of UL symbols available for the transmissionof the long PUCCH within the UL slot is greater than or equal to thesecond parameter.
 5. The method of claim 1, wherein when the number ofUL symbols available for the transmission of the long PUCCH within aspecific slot of the determined slots is smaller than the secondparameter, the long PUCCH is not transmitted on the specific slot. 6.The method of claim 1, further comprising: receiving a slot formatindicator (SFI) for providing notification of a specific TDD UL-DL slotformat from the base station.
 7. The method of claim 1, wherein the longPUCCH is transmitted using a pre-discrete Fourier transform (DFT)orthogonal cover code (OCC).
 8. The method of claim 7, wherein the longPUCCH resource is determined by pairing an OCC related to a uplinkcontrol information (UCI) part and a cyclic shift (CS) related to areference signal.
 9. A user equipment (UE) for transmitting a longphysical uplink control channel (PUCCH) using multiple slots in awireless communication system, the UE comprising: a radio frequency (RF)module for transmitting and receiving radio signals; and a processorfunctionally connected to the RF module, wherein the processor isconfigured to: receive, from a base station, first information for atime division duplex (TDD) uplink (UL)-downlink (DL) slot configuration;receive, from the base station, second information including a firstparameter for a number of slots used for a transmission of the longPUCCH and a second parameter for a duration of a PUCCH symbol within aPUCCH slot; determining the multiple slots for transmitting the longPUCCH based on the first information and the second information; andtransmitting, to the base station, the multi-slot-based long PUCCH overthe multiple slots.
 10. The UE of claim 9, wherein the multiple slotsfor transmitting the long PUCCH are determined to be a specific numberof slots from a configured starting slot.
 11. The UE of claim 10,wherein the specific number of slots is configured with an UL slot or anunknown slot.
 12. The UE of claim 11, wherein a number of UL symbolsavailable for the transmission of the long PUCCH within the UL slot isgreater than or equal to the second parameter.
 13. The UE of claim 9,wherein the processor is configured to not transmit the long PUCCH on aspecific slot when a number of UL symbols available for the transmissionof the long PUCCH within the specific slot of the determined slots issmaller than the second parameter.
 14. The UE of claim 9, wherein theprocessor is configured to receive a slot format indicator (SFI) forproviding notification of a specific TDD UL-DL slot format from the basestation.